README and comment change for pico-w examples (#242)

Author: DavidBChristensen

README.md

@@ -110,7 +110,7 @@ App|Description
 
 ### Pico W Networking
 
-These eaxmples are for the Pico W, and are only available for `PICO_BOARD=pico_w`
+These examples are for the Pico W, and are only available for `PICO_BOARD=pico_w`
 
 App|Description
 ---|---

pico_w/CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.12)
 
-if (PICO_CYW43_SUPPORTED) # set by BOARD=pico-w
+if (PICO_CYW43_SUPPORTED) # set by PICO_BOARD=pico_w
     if (NOT TARGET pico_cyw43_arch)
         message("Skipping Pico W examples as support is not available")
     else()